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Note 3 - Securities - Securities With Unrealized Losses (Details)
$ in Thousands
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Count, less than 12 months 11 10
Fair value, less than 12 months $ 108,940 $ 79,872
Unrealized loss, less than 12 months $ (30) $ (128)
Count, 12 months or more 59 85
Fair value, 12 months or more $ 37,471 $ 50,823
Unrealized loss, 12 months or more $ (459) $ (770)
Count, total 70 95
Fair value, total $ 146,411 $ 130,695
Unrealized loss, total $ (489) $ (898)
US Treasury Securities [Member]    
Count, less than 12 months 10 0
Fair value, less than 12 months $ 98,959 $ 0
Unrealized loss, less than 12 months $ (11) $ 0
Count, 12 months or more 49 73
Fair value, 12 months or more $ 35,490 $ 48,609
Unrealized loss, 12 months or more $ (394) $ (689)
Count, total 59 73
Fair value, total $ 134,449 $ 48,609
Unrealized loss, total $ (405) $ (689)
US Government-sponsored Enterprises Debt Securities [Member]    
Count, less than 12 months 1 10
Fair value, less than 12 months $ 9,981 $ 79,872
Unrealized loss, less than 12 months $ (19) $ (128)
Count, 12 months or more 0 0
Fair value, 12 months or more $ 0 $ 0
Unrealized loss, 12 months or more $ 0 $ 0
Count, total 1 10
Fair value, total $ 9,981 $ 79,872
Unrealized loss, total $ (19) $ (128)
Residential Mortgage-Backed Securities [Member]    
Count, less than 12 months 0 0
Fair value, less than 12 months $ 0 $ 0
Unrealized loss, less than 12 months $ 0 $ 0
Count, 12 months or more 5 7
Fair value, 12 months or more $ 1,158 $ 1,364
Unrealized loss, 12 months or more $ (55) $ (69)
Count, total 5 7
Fair value, total $ 1,158 $ 1,364
Unrealized loss, total $ (55) $ (69)
Collateralized Mortgage-Backed Securities [Member]    
Count, less than 12 months 0 0
Fair value, less than 12 months $ 0 $ 0
Unrealized loss, less than 12 months $ 0 $ 0
Count, 12 months or more 5 5
Fair value, 12 months or more $ 823 $ 850
Unrealized loss, 12 months or more $ (10) $ (12)
Count, total 5 5
Fair value, total $ 823 $ 850
Unrealized loss, total $ (10) $ (12)